In practice that is basically up to Steemit at this point as no one else has any budget for it. Witnesses are struggling just to justify expenses and time including 24/7 on call (top 12 are now paid about 13K USD per year), and stakeholders/investors are all heavily under water without even all that much left (my current stake in Steem which was once worth approximately 10 million USD is now worth approximately 100000 USD).

I made that exact suggestion to Steemit 1-2 years ago including some more specific detail on what sorts of experts would be best able to help; it all fell on deaf ears. By this time their available budget is also likely greatly reduced, albeit some of that is probably by their own choices to limit reinvestment of past gains back into the project (my opinion and somewhat though not entirely speculation; I have no visibility into their private books or finances).

SPS may have some available funding at some point (not yet as the pool is still being filled) but for all the same reasons (i.e. low price) that is also limited and has competing demands.

Mostly it seems we need to bootstrap and improvise at this point, as would any startup with limited funding, because that's pretty much what we are.

Also worth keeping in mind that "professional economists" is pretty broad and the number with specific expertise in the relevant sub-specialties is far smaller. Many if not most or all are likely to be highly paid working for major tech companies and other far better funded blockchain projects (and in some cases those overlap, so both).